I have a set of 81mm 906 pistons for sale. NLA from Andial and more than $300 each when they stocked them. They are listed on ebay HERE.

Also listed is a set of very nice Mahle Biral cylinders that are 80mm, can be bored to accept the 906 pistons. Thanks, Matt

http://motors.shop.ebay.com/merchant...ipgZ50QQ_sopZ1